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为什么在Python replace中比translate？快1.5倍？

In [188]: s = '1 a  2'

In [189]: s.replace(' ','')
Out[189]: '1a2'

In [190]: s.translate(None,' ')
Out[190]: '1a2'

In [191]: %timeit s.replace(' ','')
1000000 loops, best of 3: 399 ns per loop

In [192]: %timeit s.translate(None,' ')
1000000 loops, best of 3: 614 ns per loop